There are heavy-metal supergroups, and then there are heavy-metal supergroups that really know how to have fun. Adrenaline Mob — featuring Russell Allen, Mike Portnoy and Mike Orlando — is the fun kind and promoting a new album of covers, “Coverta,” with songs made famous by the Doors, Van Halen, Heart and Led Zeppelin. Adrenaline also has a hot album, “Omerta,” and new single, “Come Undone.”